Shorokhov, Alexander S.
Okhlopkov, Kirill I.
Reinhold, Jörg
Helgert, Christian
Shcherbakov, Maxim R.
Pertsch, Thomas
Fedyanin, Andrey A.
Article History
Received: 3 March 2016
Accepted: 2 June 2016
First Online: 23 June 2016
Competing interests
: The authors declare no competing financial interests.